feat(windows): apply exception check

Keyman currenlty only supports Windows 10 and 11
so the exception was low risk. If it is not available we
return false as metered connections werent possilble before
this the functionality will be the consistent with those
windows versions. i.e. always updating in the background

windows/src/desktop/kmshell/main/Keyman.Configuration.UI.UfrmStartInstall.pas

@@ -21,7 +21,7 @@ uses
   Vcl.Imaging.pngimage;
 
 type
-  // The 4 valid installation form scenarios
+  // The 4 valid installation form scenarios plus a None case for validation
   TInstallCase = (
     icNone, // Not a valid case, can be used as check before calling creating form
     icRestartRequiredMetered,

windows/src/desktop/kmshell/util/UtilNetworkConnection.pas

@@ -51,18 +51,25 @@ var
   CostLevel: IConnectionCost;
 begin
   Result := False;
-  // Get the profile currently providing internet access
-  Profile := TNetworkInformation.GetInternetConnectionProfile;
-
-  if Profile <> nil then
-  begin
-    CostLevel := Profile.GetConnectionCost;
-    Result := (CostLevel.NetworkCostType <> NetworkCostType.Unrestricted)
-      or CostLevel.Roaming
-      or CostLevel.OverDataLimit;
+  try
+    // Get the profile currently providing internet access
+    Profile := TNetworkInformation.GetInternetConnectionProfile;
+    if Profile <> nil then
+    begin
+      CostLevel := Profile.GetConnectionCost;
+      if CostLevel <> nil then
+        Result := (CostLevel.NetworkCostType <> NetworkCostType.Unrestricted)
+          or CostLevel.Roaming
+          or CostLevel.OverDataLimit;
+    end;
+  except
+    on E: Exception do
+      // If the WinRT network APIs are unavailable or throw (e.g. unusual
+      // Windows SKUs, containers, Network List Manager service stopped),
+      // treat the connection as non-metered so updates are not blocked.
+      Result := False;
   end;
 end;
-
 function IsBackgroundDataRestricted: Boolean;
 var
   Profile: IConnectionProfile;
@@ -70,15 +77,18 @@ var
   DataRestriction: IConnectionCost2;
 begin
   Result := False;
-  Profile := TNetworkInformation.GetInternetConnectionProfile;
-  if Profile <> nil then
-  begin
-    CostLevel := Profile.GetConnectionCost;
-    if (CostLevel <> nil) and Supports(CostLevel, IConnectionCost2, DataRestriction) then
+  try
+    Profile := TNetworkInformation.GetInternetConnectionProfile;
+    if Profile <> nil then
     begin
+      CostLevel := Profile.GetConnectionCost;
+      if (CostLevel <> nil) and Supports(CostLevel, IConnectionCost2, DataRestriction) then
         Result := DataRestriction.BackgroundDataUsageRestricted;
-        Exit;
     end;
+  except
+    on E: Exception do
+      // See IsMetered: default to not-restricted if the WinRT APIs throw.
+      Result := False;
   end;
 end;